Check appservice user interest against the local users instead of all users (`get_users_in_room` mis-use) (#13958)

1 files changed, 3 insertions, 0 deletions

diff --git a/synapse/storage/databases/main/roommember.py b/synapse/storage/databases/main/roommember.py

index ab708b0ba5..e56a13f21e 100644
--- a/synapse/storage/databases/main/roommember.py
+++ b/synapse/storage/databases/main/roommember.py
@@ -152,6 +152,9 @@ class RoomMemberWorkerStore(EventsWorkerStore):
         the forward extremities of those rooms will exclude most members. We may also
         calculate room state incorrectly for such rooms and believe that a member is or
         is not in the room when the opposite is true.
+
+        Note: If you only care about users in the room local to the homeserver, use
+        `get_local_users_in_room(...)` instead which will be more performant.
         """
         return await self.db_pool.simple_select_onecol(
             table="current_state_events",